Name: Construtor de String Parte 1
Uploaded: 2017-03-14T22:57:51.000Z
Duration: 1 min 52 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Adverbs of degree

Here's a summary of what we just learned.

A string is immutable, which means it can't change once it's been created.

You have to create a brand new string object if you want a slightly

On the other hand, a StringBuilder is also a sequence of characters, but

So it can change after you've created it.

Now, there are pros and cons of when to use each one.

But if you're trying to build up a longer text string gradually over

several steps, then StringBuilder is a much more efficient data type,

Otherwise, if you had to create a new string object at each intermediate step,

And those additional memory allocations would need to be cleaned up once those

It's much cleaner to have a single StringBuilder object and

Okay, so let's look at the code for how to use the StringBuilder class.

We can declare and instantiate a new StringBuilder as usual, and

world spelled W-O-R-L-D into the builder using the append method.

Now, the StringBuilder is currently holding the sequence of characters

instead of world by removing the L character at position three.

When we do this the builder now contains the characters W-O-R and D, or word.

Then the code appends more characters on the StringBuilder.

First, we add space builder and then finally a period.

Note that the append method returns a builder object, so what's neat

is that we can actually have multiple calls to append on a single line.

This sequence of multiple meta calls on a single line is known as method

So as you can see, the second time we call append, we can add a period.

When we're done building we can get a frozen immutable string

So as we finish we can see that the String variable built